In the example above, 30 might not be completely accurate. The rear end axle is responsible for transmitting power to the rear wheels in a rear wheel drive vehicle. Your email address will not be published. Without positraction only one rear wheel receives the power. Time for Change… There’s an old saying that goes: Great Jeeps aren’t bought, they’re built. West Coast Differentials has been distributing quality differential and axle parts since 1982. Our gear and axle experts will be happy to assist at (800) 510-0950. Enter the maximum potential safe engine RPM. 2429 Mercantile Drive Suite A, Rancho Cordova, CA 95742, Copyright © 2017 West Coast Differentials | Website Design by. If your vehicle has a low gear ratio, you can offset this by installing slightly larger diameter tires. Tires with identical specifications that are made by different manufacturers may have different actual diameters. Evidence of this can be found at any Jeep […], Whether you’re into Jeeps or not, you have to admit the Jeep brand has generated one heck of an aftermarket over the past few decades. For inquiries about our products and services, please fill out the form below. The speed you want to drive at, usually 75mph . For example: The gear ratio of each overdrive gear of your transmission. EXAMPLE With Overdrive (30%): 1800 RPM / 656.93811 = 2.73:1 x 130 = 3.54:1 If you don’t actually have the tires installed on the vehicle yet, use the metric tire diameter calculator below to determine tire diameter (height) using metric size designations. West Coast Differentials stocks a huge inventory of OEM and Aftermarket Ring & Pinion Gear sets and orders placed before 4 PM Pacific Standard time usually ship the SAME DAY! This page is a Differential Gear Ratio Chart for comparing tire size to axle gear ratio and the combined effect on power and fuel economy. 23 Mount Erin Rd, Blair Athol NSW 2560, Australia +61 2 9607 2299 This gives us confidence in the quality of the parts we sell. The window sheet says I should get between 22 to 26 mpg. Right down that RPM number. differential gear ratio 2.94 – 4.27. Drag Max RPM slider to adjust the range of the RPM and km/h Gauges. On nearly every trail ride I’ve ever been on, there have been stops along the ride […], I knew it was time. The simplest method is to measure the height of the tire from the ground to the top of the tire. 2.94: 3.07: 3.21: 3.31: 3.42: 3.55: 3.73: 3.91: 4.11: 4.27: 28: 2293: 2395: 2504: 2582: 2668: 2769: 2909: 3050: 3206: 3331: 29: 2214: 2312: 2417: 2493: 2576: 2674: 2809: 2945: 3095: 3216: 30: 2140: 2235: 2337: 2410: 2490: 2584: 2715: 2846: 2992: 3109: 31: 2071: 2163: 2261: 2332: 2409: 2501: 2628: 2755: 2896: 3008: 32: 2007: 2095: 2191: 2259: 2334: 2423: 2546: 2669: 2805: … We believe that our exceptional customer service and product knowledge is what sets us apart from the competition. This Jeep show / Jeep event is fast becoming the most popular Jeep Show and Shine in the […], Installation and Review of the Maximus-3 Winch Mount, Bumper Hoop, Hook Anchors & D-Ring Loops The Mopar designed Rubicon X front bumper is a great foundation for a superb, strong and utilitarian styled factory front end. Metric tire specifications use a three number format, such as 275/75R16, where 275 is the WIDTH of the tire tread in millimeters, 75 is the ASPECT (or percentage of tread width to yield the sidewall height), and 16 is the WHEEL diameter. For the fastest service, call our Differential Parts Experts at (800) 510-0950 for immediate assistance. Consult our Look up chart for determining engine RPM, gear ratio and tire size combination. Your vehicle will probably run at different RPM’s than those you calculate. Click “Calculate Differential Gear Ratio”. See What gear ratio do I need in FAQ for a discussion on choosing a ratio. We think top-notch customer service is the most important thing we do. Multiply that number by any speed, 50, 60, 75 etc. I had seen and heard enough. We have the Differential Gears to match your budget and performance needs. Write down that number. What is a Jeep-a-Split? Write down that number. Divide that number by 60. The chart below will assist you in finding your new gear ratio needed to give you optimal performance. For example, a 3.73 gear ratio requires 3.73 driveshaft rotations to turn your tires once around. When I found out what […], Back in October of 2018, FCA (Fiat Chrysler Automobiles, the parent company of the Jeep brand) announced a massive recall on about 18,000 new Jeep JL Wrangler to inspect and repair bad welds on a […], In swapping the T-18A onto this Jeep project, a good tip was passed onto me from Mike of How to dry out a wet smartphone the right way. For example, a vehicle with a 4.10 axle with 30.2 inch diameter tires will have a new gear ratio of 3.97 with 31.2 inch diameter tires installed. Enter Shift at RPM, select gear to shift to and hit Shift and Trace to run up through the gears recording shift point RPM and km/h. Check Compare and enter alternate Tire Diameter or Diff Ratio to compare. The most current parts and application information can always be found here on our website or by calling one of our differential parts experts. The gear ratio of each overdrive gear of your transmission. The key to understanding gear ratios is to remember that, as the numerical ratio goes up, towing capacity increases but fuel economy goes down. Jeep-a-Split Jeep – Willys Overland Implements, 7th Annual All Breed Jeep Show in York – Presented PA Jeeps, Differential Gear Ratio to Tire Size Guide, All Terrain AT & Mud Terrain MT Tire Buyers Guide. As part […], One of the cool things about a Jeep is that its a mobile platform for enjoying the great outdoors. We are available to help Monday thru Friday from 8 AM to 5 PM Pacific Standard Time, and most orders placed by 4 PM ship out the SAME DAY! The speed you want to drive at, usually 75mph . The RPM calculator should be used as a guideline for comparative purposes only. Pick the tire hiegth, pick your gear ratio. The calculated value should be used only as a guideline for RPM calculations. Truck and off road tires may have a specification like 30×9.5R15, where 30 is the tire diameter, 9.50 is the tread width and 15 is the wheel diameter. Literature Where To Buy Share. Larger tires on lifted truck suffer from loss of power, changing the ring gear and pinion to a lower ratio is the answer. My friend…, Tire Terminology – Lots of Information about Tires, Northeast US 4×4 Off Road Clubs Directory, Southeast US 4×4 Off Road Clubs Directory, Northwest US 4×4 Off Road Clubs Directory, Southwest US 4×4 Off Road Clubs Directory, Great Jeeps aren’t bought, they’re built – Project Rubicon X, Installed on Project Rubicon X: Maximus-3 Winch Mount, Bumper Hoop, Hook Anchors & D-Ring Loops, Maximus-3 Winch Mount Installation – Bumper Removal, Review: Maximus-3 Classic Hoop, Winch Mount, D-Ring Loops, Hook Anchor & Light Brackets – Rubicon X/10A/Hard Rock, D-Ring Loops Installed on Project Rubicon X. Literature. How to use the chart. This tip has to do with the stock clutch fork being used in the stock bell […], Copyright © 2020 | MH Magazine WordPress Theme by MH Themes, Mud Tires – MUD TIRES or MT are as you might have gathered from the name, designed to perform most specifically in the mud. This calculator will assist you in determining the ratio between the ring gear and pinion gear in the differential housing in the rear end axle of a vehicle. 1101 W. Rialto Ave. Rialto, CA 92376, USA +1 (310) 361-0020. Near the end of WWII, Willys began looking for ideas to help introduce the Jeep to the civilian market. I have an 1986 Jeep Comanche2.5L I4 with % speed manual Transmission and a 4.11. Share. FIGURING REAREND GEAR RATIO (Ring & Pinion) FORMULA: Engine RPM @ Cruise / Tire Revolutions Per Mile = Rear-end Gear Ratio EXAMPLE Without Overdrive: 1800 RPM / 656.93811 = 2.73:1 EXAMPLE Without Overdrive: 2000 RPM / 656.93811 = 3.04:1. Pick the tire hiegth, pick your gear ratio. How to use the chart. Why you need a positraction? They include the calculations for all gear sets and pinion ratios. By asking ourselves what makes us different than other companies, our answer is that we deliver the level of customer service that other companies only promise.

diff gear ratio chart

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